diff -Nur sys.orig/conf/kern.mk sys/conf/kern.mk
--- sys.orig/conf/kern.mk	2012-12-31 17:51:27.000000000 +0900
+++ sys/conf/kern.mk	2012-12-31 17:55:03.000000000 +0900
@@ -5,7 +5,7 @@
 #
 CWARNFLAGS?=	-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
 		-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
-		-Wundef -Wno-pointer-sign -fformat-extensions \
+		-Wundef -Wno-pointer-sign \
 		-Wmissing-include-dirs -fdiagnostics-show-option \
 		${CWARNEXTRA}
 #
@@ -52,7 +52,7 @@
 #
 .if ${MACHINE_CPUARCH} == "i386"
 .if ${COMPILER_TYPE} != "clang"
-CFLAGS+=	-mno-align-long-strings -mpreferred-stack-boundary=2
+CFLAGS+=	-mpreferred-stack-boundary=2
 .else
 CFLAGS+=	-mno-aes -mno-avx
 .endif